For five years, a 40-year-old woman has had an itchy, erythematous, papular eruption with indistinct margins localized to particular areas on the exposed surface of the face. The eruption is precipitated by sunlight or fluorescent lighting and can be reproduced by exposure of affected parts of the face to long ultraviolet radiation (UV) but not by exposure to the shorter sunburning UV. It cannot be reproduced on the skin of the back. Frequent application of a sunscreen that absorbs the long UV completely supresses the eruption. This entity has not been described previously, to my knowledge.
Emmett EA. Fixed Long Ultraviolet Eruption. Arch Dermatol. 1975;111(2):212-214. doi:10.1001/archderm.1975.01630140070007